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D1 route inspection question - find a route starting and finishing at A? Watch

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    Its an Edexcel June 2010 paper.
    So I have worked out the routes that should be travelled twice
    They are EG + CB (CA + AB).
    So when I actually draw the extra path in the graph to find a route, do I draw two lines EG and CB directly or do I draw three lines? EG AB CA?
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    You draw EG AB and CA. Then you can find a route, otherwise if you just draw CB then you won't have enough nodes listed. Hope that helped
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    The thing with route inspection when you're trying to find which arc to go through twice, you always do it so that you repeat a arc.
    You would draw EG, CA and AB.

    you wouldn't do CB if there wasn't an arc connecting the two nodes, or if there aren't any other alternatives that give a smaller length.
    Hence the reason why it tells you to minimize the route as much as possible.
 
 
 
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